Radial drill.



W. T. SEARS.

RADIAL DRILL.

APPLICATION FILED JAN.25,1913,

.@@Qg Paname@ Mar-.10,1914

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W. T. SEARS. RADIAL DRILL APPLICATION FILED J'.AN.25,1913.

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UNITED STATES ITENT OFFICE.

WILLARD T. SEARS, OF HARTFORD, CONNECTICITT, ASSIGNOR 'IO PRATT ScWHITNEY COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF NEW JERSEY.

RADIAL DRILL.

To all whom it may concern.'

Be it known that I, WILLARD T. SEARS,

a citizen of the United States, residing at Hartford, in the county ofHartford and State of Connecticut, have invented certain new and usefulImprovements in Radial Drills, of which the following is a specifica-`tion.

This invention relates to radial-drills, one

t of the primary objects of the invention beand substantiallymaintaining said column in an adjusted relation when necessary.

In the drawings accompanying and forming part of the presentspecification I have shown in detail one of the several convenient formsof embodiment of the invention which I will set forth fully in thefollowing dei scription to enable those skilled in the art to practisethe invention. myself to this disclosure; I may depart therefrom inseveral respects within the scope of the invention defined by the claimsfollowin said description.

Referring to said drawings: Figure l is a side elevation of aradialdrill involving ,30 the invention. Fig. Q'is a detail view withaportion broken away to show the internal construction, of a base. Fig.3 is a horizontal section on the line 3-3 of Fig. l, and, Fig. 4 is avertical section on the line 4 4. of rig. s.

Like characters refer to like parts throughout the several figures ofthe drawings which it will be observed are on different scales.

The machine'showminvolves in its construction a base or bed as 2 and acolumn as 3, the' latter as will hereinafter appear being tiirnablcabout a vertical Mounted on and rigidly secured to the hase in somedesirable manner as by bolts 4, is l a footpiece, and the base or bed 2and this footpiecg 5 jointly present a suitable Specification of LettersPatent.

Application i'iled January 25, 1913.

I do not limit axis.

Patented Mar. 10, i914. Serial No. 744,087.

l hereinafter appear, has a bearing at several places against itssupporting means. The feotpiece or shell 5 is shown having an inwardlyextending flange 7 at its top which as will be hereinafter set forth isprovided with a coluiiiii-sustaining track. The inwardly extendinglflange 7 is furnished with a pendent or vertically disposed Harige 8 toreceive the cylindrical journal portion 9 of .the column 3 which, aswill be clear, has a turning' contact in the annular liaiige or sleeveS, this being one of the several bearings for the column. It may, ofcourse, not always be necessary to provide several of such bearings,although greater rigidity is insured when they are present. The lowercylindrical Aportion l() of said column is fitted for turning movementin the annular flange or band 1l atthe center of the disk or plate l2fastened at or near its margin hy screws 13 or otherwise. to the uppersurface of the base or bed 2, said upper surface being coiicaved ordished as at la to receive the lower end of the column 3 and the band orflange ll. This hand 1l provides a second bearing, for the column. Saidcolumn near its lower end is rahbeted or channeled as at l5. to receivethe ring 16 fastened as hy screws i6 to the column. the active surfaceof this ring;V .1G being oii an outward downward taper to lcooperatewith a similar taper or cone surface on the divided or split clampingring i7 surroundingI the column und having a bearing;F against theannular flange 18 in tlie'footpiece 5.

As will hereinafter appear the column is equipped with an anti-frictionroller which has a vieldahle engagement with the sup port for saidcolumn. and although this vieldable engagement can he secured in severalways. l prefer that it be accomplished by yieldingly mounting theroller. ,lthough this roller may he located at any i desirable point. Iprefer that it be substan-l tially coincident with the center of gravityof the column structure: that is. the column i and the parts carried byand movable there- Isupport for the column 3 which is shown l with. tothus secure the best results.

provided with the spindle-supporting arml 6 furnished with the usualaccessories which form no part of the present invention and i hencerequire no description.

The footpiece 5 as illustrated is in the;i form of a shell receiving forrotation the There is shown set in the upper part of the footpiece 5 anannular track oi' runway i9, the flange 7 having a circular groove 20 toreceive said track which is to be traversed during,r rotary adjustmentsof the column 3, by anti-friction means on the column, said lowerportion afthaenlnmn 3 which as will l anti-frietion'means consistingpreferably of veasy turning movement-of said column is can a singletruste-conical or tapered roller 2i preferably yieldingly supported bysaid col umn. In the showing made the apex of the cone defining theoperative surface of the roller 21 is coincident approximately with theaxis of rotation of the column, so that insured. The conical roller 21is carried by a stud 22 supported by the branches of a fork on the outerapproximatelydiorizontal arm of the angle lever 23 pivoted at its angleat 2l in a slot or aperture in the column, the depending or vertical armot' the angle lever having an adjusting 'screw 25 bearing against theinnermost one of several superimposed bowed springs 26 overl ying theslot 27 in thecolumn 3, so that the necessary resiliency of the springmeans is obtained. By the adjustment of the screw 25 the tension of thespring means against the lever 23 can be regulated. The springs 2Gacting against the tail portion of the lever Q3 maintain the roller Q1yieldingly against. the track 19 to put the flange 28 in very lightcontact with the upper edge ofthe footpiece 5, so thatv when thisrelation is present the column 3 can be readily turned for purposes ofadjustment.

"ECO hold the column in an adjusted posi tien it is clamped to itssupport in some suitable manner as by the wedge ring 17 which whencontracted tends tol force down the companion ring 16 by reactionagainst the flange 18,-to clamp thc'fiange 2S of the column 3 solidlyagainst the tootpiece 5. The ring 17 at its terminals is provided withoutwardly extending ears Q9 having opposite threads to receive theoppositely threaded portions of the screw 30. It will be apparent thatwhen the screw is turned in one direction the ring 17 will becontracted, so that its wedge or cone portion will tend to draw the ring1G downward, while when turned in the opposite direction the ring 16 isfreed. To operate the screw and therefore the divided actuating band 17I provide electrical means, the solenoid 3l being shown for thispurpose, the armature of said solenoid being connected with the arm 32fastened as by the screw 33 to the adjusting screw 30. When the solenoid31 is energized, the lever or arm 32 will be drawn upward to contractthe ring 17 while denergization of the solenoid permits the expansion ofsaid ring 17.

That I claim is: l

'1. The combination of a support, a rotary column carried by thesupport, a roller carried by the column, means for yieldingly i 'forcingthe roller toward the support, and means Jfor drawing the column intorigid engagement with the support and at thel same time causing therelative retraction of the roller. 'l

2. Th'e combination of a support, a rotary column carried by thesupport, a circular tract; on the support, a single conical rollercarried by the column, to travel in Contact with said circular track,means for yieldingly forcing the means for drawinV the column into rigidengagement with tne support and for causing at the same time therelative retraction of the roller suiicient to permit the column to comeinto clamping engagement-with the support.

3. The combination of a support, a column structure rotatirely carriedby the support, a circular track on the support7 and a single conicalroller on the column to travel in contact with said support, andsituated approXimately at .the center of gravity of said -column and theparts supported thereby.

4. The combination of a support, a rotary column carried by the support,a wedge ring rigid with said column, `a divided Wedge ring active whencontracted to act against the first wedge ring, to clamp said columnt tosaid support, and means comprising an electrically. operated device forcontracting said second wedge ring.

5. ln a radial drill. the combination or a support, 'a rotary columncarried by said support, a circular track on the column, 'a

singleconical roller, a yieldingly mounted lever on the column, uponwhich said roller is mounted. said lever being adapted to move saidroller toward said column, and means for clamping said column to saidsupport and at the same time for causing the relative retraction of thelever and thereby'the roller suliicient to permit the column-to comeinto clamping engagement with the support.

6. The combination of asupporta'rotary column carried by the support, acircular track on the support, a'single conical roller to travel incontact with said track, a lever pivotally mounted between its ends,said roller being rotatively connected with one branch of the lever,spring means acting against the other branch of said lever, to forcesaid roller yieldingly toward said sup port,` and mechanism for clampingsaid col# umn rigidly to said support and at the same time causingrelatively the retraction of said lever and thereby the roller suiicientto permit the column t0 come-into clamping engagement with the Support.

ln testimony whereof I atlix my signature in presence of two witnesses.

VVlL-LARD T. SEARS.' Witnesses lV. M. Stroms, C. M. GELLERT.

roller toward the support, andA

